fix indent in vim mode

plugins/node_modules/ace/lib/ace/keyboard/vim.js

@@ -6037,7 +6037,7 @@ dom.importCssString(".normal-mode .ace_cursor{\
     var name = '';
     if (e.ctrlKey) { name += 'C-'; }
     if (e.altKey) { name += 'A-'; }
-    if (e.shiftKey) { name += 'S-'; }
+    if ((name || key.length > 1) && e.shiftKey) { name += 'S-'; }
 
     name += key;
     if (name.length > 1) { name = '<' + name + '>'; }